OpenGeoSci is a free, public map based interface that allows users to search for maps, cross sections, charts, tables, figures, and data from GeoScienceWorld
An exhaustive database that provides bibliographic access to thousands of geologic, geophysical, and other kinds of maps available in USGS publications.
NCEI provides access to comprehensive atmospheric, coastal, oceanic, and geophysical data such as ocean depth information, sun surface data, sediment records and satellite imagery.